Joint and method of making the same



` H. c. LORD JOINT AND METHOD OF MAKING THE SAME Filed Nov. 24, V1922 iAug.- 4, 1925. 1,548,049

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UNITED STATES HUGH C. LORD, OF ERIE, PENNSYLVANIA.

.rom AND unrnon' or MAKING' ran snm.

Application led November To all whom it may concern:

Be it known that I, HUGH C. LORD, a citizen of the United States,residin at Erle, 1n the county of Erie and State o Pennsylvania, haveinvented new and useful Improvements in-Joints land Methods of Mak- Y orjoint member.

ing the Same, of which `the following lis a; specification.V

The 'invention i's directed to joints in which the joint members areunited by -a rubber. insert, the rubber insert through its distortionsustainingthe joint action. It is desirable to unite several jointmembers and this can be conveniently done with this 'form of joint byvulcanizing the rubber of the several joint members to a commonvcentralpin,

Such a joint is particularlydesirable for shackle joints for springs andas shown is so illustrated. In forming such .joints it is desirable tohave the. joint as a unit, thatjis t0 say, with a central pin and outermetallic shell which may be readily connected with the shackle hangers,or other members to which the joint is attached. In order to surely bondthe rubber to these metal surfacesit is necessary to have the rubberunder pressure and also to have the rubber co-extensive with the lengthof the metallic members, 0r at least one of the members and it isdesirable to have the outer` shell of uniform size so that it may bereadily inserted in an automobile Jframe, or other 'part where it isused. The invention is directed to these differentl features and methodsof making devices having these features. ,f

The' accompanying drawings show the features of the invention andmeans'for carrying out the method as follows Fig. 1 shows asideelevation of an automobile With a spring shackle in 'place thereon. v

Fig. 2 a central section through a :spring shackle on the line 2-2 inFig. 3.

Fig. `3 a section on the line 3-3 in Fig. 2.

n Fig. 4 acentral section of the joint elements in"t an intermediatestage of manufacture.

Fig. 5 the completed article.

Fig. 6 a metho of molding the joint.

Fig. 7 an alternative construction.

1 marks the chassis frame, 2 the spring,

. 3 the joint elements in the spring andrrame of the shackle, and 4 theshackle hanger.

Each joint of the shackle has a central pin end and discharging it34,1922. serial No. 602,995.

5, a central shell 6, and a rubber joint member 7 bonded to the outersurfaces of the pin 5 and the inner surface of the shell 6. End jointmembers are formed on the pin 5, these having a shell 8 and rubbermember 9 vulcanized to the pin 5 and to the inner surface of the shell8.

The hangers 4 are formed in halves arid .have the cups lOwhich receivethe shells 8.

The two halves are put together and screws 11 extend through.perforations 12 in one halt` into screw-threaded openings 13 in otherhalf. In this way the shells 8 are clamped and locked against turning inthe cups 10. 4The two sides of the hangers 4 are connected by a crossipiece 14 whichmaintains the two sides in parallel and also forms theusual-stop for preventing the reversing of the hanger by the action ofthe spring. The central shell 6 extends through a spring eye 2, thespring eye ordinarily" being simply wedged open so as to permit of theslipping of theI shell into place. `The bottom shell 6 is forced intothe eye 1 of the frame and, this locks lit in place. Other means ofsecuring Yit in the frame may be utilized if desired.

With this construction it will be seen that a single central member isused, thus-doing away with any metallic joints or-connections of anykind. At the same of the hanger 'is divided between the rubber' members7 and l9, each receiving half of the twist., l Y

This joint may be advantageously formed by the following method.ITheouter shells 6 and 8 are initially integral and the rubber for thewhole element is vulcanized in place and bonded on the pin and shell asclearly shown in Fig. 4, the integral shell beingindicated as 15. Afterthe vuleanization of this formation the shell is parted at` 16 and therubber cut down to the central pin 5.

It is necessary to get the and quality or' rubber to vulcanize the rub-.ber under pressure and. in inserting 'the rubber in the shell 15 someexcess isvl desirable atene end. By placing all'the excess at one of theform it is pressure .and at ,t e same tllbln In ig. 6 I lhave shown a dimold for this purpose, the mol being am of a.

the

l time the distortion of the'rubber due to a given swinging..

proper bonding at the opposite end ossible to get aunlform time to sizethe inne the form of a sleeve 17 in which the shell with 'the insertedpin 5 and the rubber suiicient for the walls 7 and 9 is in place.

The sleeve is closed by a plug 18 at one end, this plug having acentering pin 19 entering an opening 20 in the end of the pin. A movableplunger 21 with a centering pin 22 is arranged at the opposite end, thecentering pin operating in an opening 23 in v,the end of ythe pin 5. Theexcess of rubber, as indicated' inl-,dotted lines is supplied at theendrunderithe plunger 21 and the rubber supplied should be small inamount otherwise its movement through the metal parts may disturb thebonding coatings in theseparts. The `excess of rubber is dischargedthrough an opening 18a in the plug 18, the size of this openingdetermining to some extent the pressure to which the rubber is subjectedin the mold. The pressure ordinarily used is ample to expand or extendthe shell 15. In consequence the process of molding brings the shell 15and consequently the shells 6 `and 8 to an accurate gauge. This isimportant if the shell is to be inserted by pressure in the openings inthe frame.

ile in the preferred construction this is used for a ljoint of a springshackle in the broader aspects of the linvention a plu-v rality ofjoints on a singlepin may be utilized in the manner shown in Fi 7 inwhich a single central pin .24 is provi ed, the ends oi this pin formingthe supports tor a plurality of joints, each joint having an outershell`25 and an intervening portion otrubber bonded to the shell 25 andto the pin 24.

What l claim asnew is 1. ln a joint, the combination of a central pin; aplurality of rubber units bonded on the pin; and joint members bonded onthe outer surfaces of the rubber units.

joint member bonded on the outersurfaces of each of theend units ofrubber; and a connection between the joint members on the end unitscompelling them to operate munison.

4. The method of forming joints which consists in bonding anintermediate joint member of rubber `to a central metallic 'within themetallic tube; a central the central unit; a joint member bonded Yon theouter surface of the central unit; a

member and an` outer metallic member, and severing the outer metallicmember and the rubber .to form a plurality of joint members operating onthe same central member.

5. The method of Aforming joint members which consists in assembling anouter metallic joint member, aninner metallic joint member with aninterposed 'amount of rubber for forming an intermediate joint member,confining the. outer joint member in a sleeve,subjecting the rubber topressure and heatfor the vulcanizing and the bonding o the rubber to themetallic members, the pressure expanding the outer joint member to giveit a size corresponding to the mold sleeve.

6. The method of forming joint members which consists in assembling acentral metallic member, an outer metallic member, and rubber foryulcanizationI between them with an excess of rubber at one end,conlining the assembled articles within a mold, and providing anoverflow for the rubber at the end opposite that having the excess.

7. The method of forming joints which consists in assembling a centralmetallic 'oint member, an outer metallic joint memer with an interveningportion of rubber, centering the central joint member relatively to theouter member, and vulcanizing the rubber in placebetween the jointmembers under pressure.

8. ln a joint for springs, the combinatio'it of a spring eye; an elasticrubber joint member secured within the s ring eye a central member towhich the ru ber mem er is secured; end rubber units locked with 'thecentral member; and joint members secured to the outer surfaces of theouter units of rubber. f

9. In a joint for springs, the combination of a spring eye; a pinextending through the eye; a rubber insert between the pin and eye;rubber units at each side of the eye and locked with the pin; andshackles connected with the outer surfaces oi the rubber units at theends.

10. In a joint for springs, the combinat tion of a spring eye; a jointelement comprisinga central metallic tube secured to the spring eye; arubber elastic member in to which the rubber member is secure; end

mit

ney

rubber members locked with the pin; and

shackles secured to the end members.

11. ln a joint for springs, the combination of a spring eye; a inextending through the spring eye; rub the pin and secured to the springeye; rubber units bonded on the ends of the in; and' shackles secured tothe outer sur a of the e'nd units of rubber.

12. 1n a joint for springs, thev combination ,of a spring eye; anelastic joint member comprising a central pin; efeentral ruber bonded onf ber unit bonded on the pin; two end rubber -units bonded on the pin;metallic shells `.bonded on the outer surfaces of the rubber units, thecentral metallic shell being secured in the spring eye; and shackles se'cured to the shells of the outer units.

' said rubber units; shackle links, said links 13. In a joint forsprings, the combination of a shackle comprising two shackle links;rubber units at each end of each shackle link and locked therewith; pinssecured to the inner peripheriesf said rubi -ber units and extendingfrom a rubber unit in one shackle to a rubber unit inthe other shackle;central rubber units secured to said pins; a spring locked with onecentral'rub'- ber unit; and a support locked with the other of saidcentral units.L 14. In a joint forsprings, the combination of shacklepins; .rubber units securedv to the `shackle vpins; metallic shellssurroundingv said rubber units; shackle links, said links comprisingeyes in which the metallic shells are arranged; and means for closingthe eyes to clamp the shackle links on the shells.

15. In a joint for springs, the combination of shackle pins; rubberunits secured to the shackle pins; metallic shells surroundingcomprising eyes in which the metallic shells are arranged; means forclosing the eyes t0 clamp-theshackle links'on the shells; and

means for rigidly ,connecting the shackle links.

16. In a jointfor springs, the combina-A tion of a shackle comprisingshacklelinks; rubber units at each end `of each shackle link andlockedtherewith; pins secured to A the inner peripheries of said rubber unitsand extending from a rubber unit in one shackle to a rubber unit intheother shackle; central rubber units secured to said pins; a springlockedwith one central rubber unit; a support locked with the other of saidcentral units; and a rigid connection between the shackle links. A v

17. In a joint, the combination of a central pin; a plurality of rubberunits bonded onthe pin; andjoint members secured A.

outer surfaces ofY each of| the end units ofi *I rubber.` Y .v ,v i I Intestimony whereof I have hereunto set my hand. .v

HUGH o. LORD;

